intransitive verb
Definition: To change direction or course, especially in sailing, by turning the bow of the boat into the wind.
Example: The sailboat tacked to avoid the strong winds.
noun
Definition: A small nail with a sharp point and a flat head, used for fastening things together.
Example: He used a tack to hang the picture on the wall.
transitive verb
Definition: To attach or fasten something in place, often using a small pointed object or by adding it as an extra item.
Example: She tacked the notice to the bulletin board so everyone could see it.